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Karim Baratov transformed himself from a “nerdy introverted” computer science high school student to a flashy, expensive car and body-building enthusiast in a few short years.

But his sudden wealth might not be legally earned and his good luck may have run out.

The 22-year-old Ancaster man is one of four men who allegedly inflicted a series of devastating cyber attacks on Yahoo since 2014.

Accused of computer hacking and economic espionage, Baratov is now in custody and will be back in Hamilton court Friday. He’s facing possible extradition to the U.S. where such crimes carry lengthy prison terms.

In recent Facebook and Instagram images, Baratov is seen posing with his Aston Martin and Mercedes vehicles in the driveway of his million-dollar Ancaster home.

The alleged attacks started only one year after Avian Yuen last saw Baratov in their computer science class at Ancaster High School.

“He was very good. He made video games quickly,” recalled Yuen, “He was the nerdy kid with glasses at the back of the class.”

“He was quiet and introverted,” the third-year chemical engineering student at McMaster University added.

Yuen, 20, was happy for his classmate’s swift change in fortunes.

“I thought good for him — he managed to find a way for himself,” said Yuen, who kept in touch with Baratov through Facebook but hasn’t seen him face-to-face since 2013.

“I was surprised when I heard the news. I didn’t think he’d be connected with this,” said Yuen.

Baratov’s Instagram postings boast that he made his first million dollars when he was a 15-year-old performing “on-line services.”

Mike Le, of All In Detailings in Mississauga, recalled Baratov getting his Aston Martin serviced in January. Le met Baratov and his girlfriend last summer at his company’s barbecue.

“He’s a popular guy and has lots of girls. He’s single, good-looking and appears to have money,” said Le.

“But Baratov said half of them just want to be gold diggers. He’s an intelligent guy. He was weight-lifting especially the last seven months,” said Le. “He’s more muscular now than he was last summer.

“We just talked about random young kids’ stuff, cars, girls he’d met and that those sort of thing,” Le said of the January visit.